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                            介绍Canary 的意思是金丝雀，来源于英国矿井工人用来探查井下气体是否有毒的金丝雀笼子。工人们每次下井都会带上一只金丝雀。如果井下的气体有毒，金丝雀由于对毒性敏感就会停止鸣叫甚至死亡，从而使工人们得到预警。
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